CuCr Contact Disc
The CuCr contact disc is the geometry that does the work inside a vacuum interrupter.
Copper chromium is the standard contact material for medium-voltage vacuum interrupters. Inside a vacuum circuit breaker or vacuum contactor, the pair of contacts that make and break the circuit under vacuum are almost always CuCr. The copper matrix carries continuous current, and the chromium phase handles the arc during interruption, suppresses contact welding, and keeps the chopping current low. Where CuW (copper tungsten) dominates in SF6, oil, and air-insulated MV switchgear arcing contacts, CuCr dominates inside the vacuum bottle. We supply CuCr contacts in the grades covered by GB/T 26867-2011 (Chinese national standard for copper-chromium electrical contacts) : CuCr25 for high-conductivity general-purpose vacuum interrupter duty, and CuCr50 for higher-rated, high-cycle, and severe interruption duty where anti-weld behavior and low chopping current matter most. Contacts are produced as discs and custom geometries to drawing, in axial-magnetic-field (AMF) and radial-magnetic-field (RMF) forms.
The CuCr contact disc is the geometry that does the work inside a vacuum interrupter.
CuCr custom component is the catch-all listing for copper-chromium parts that don't fit the standard disc, AMF, or RMF contact forms.
CuCr25 is the high-conductivity copper-chromium grade, 25% chromium in a copper matrix, and the most common contact material for general-purpose medium-vol...
CuCr50 is the high-chromium copper-chromium grade, 50% chromium in a copper matrix, for vacuum interrupters with severe interruption duty.